package com.gimi.common.cinema.utils;

import android.graphics.Bitmap;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

import java.util.Hashtable;

/**
 * @author Ryan Tang
 */
public final class QRCodeUtils {
    private static final int BLACK = 0xff000000;

    public static Bitmap createQRCode(String str, int widthAndHeight) throws WriterException {
        Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        BitMatrix matrix = new MultiFormatWriter().encode(str,
                BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        int[] pixels = new int[width * height];

        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                if (matrix.get(x, y)) {
                    pixels[y * width + x] = BLACK;
                }
            }
        }
        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }

    /**
     * 用字符串生成二维码
     *
     * @param text
     * @return
     * @throws WriterException
     */
    public static Bitmap create2DCode(String text) throws WriterException {
        return create2DCode(text, 100, 100);
    }

    /**
     * 用字符串生成二维码
     *
     * @param text
     * @return
     * @throws WriterException
     */
    public static Bitmap create2DCode(String text, int qrWidth, int qrHeight) throws WriterException {
        //生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.MARGIN, 0);
        BitMatrix matrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, qrWidth, qrHeight, hints);
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        //二维矩阵转为一维像素数组,也就是一直横着排了
        int[] pixels = new int[width * height];
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                if (matrix.get(x, y)) {
                    pixels[y * width + x] = 0xff000000;
                } else {
                    pixels[y * width + x] = 0xffffffff;
                }

            }
        }

        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        //通过像素数组生成bitmap,具体参考api
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }
}